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FAQs

What is an Electronic Horizontal Situation Indicator (EHSI)

The Electronic Horizontal Situation Indicator (EHSI), often referred to as the Navigation Display (ND), replaces a number of different instruments found on a conventional aircraft instrument panel, and may be used to depict some or all of the following information: heading flown;heading or track selected;bearing to or from a navigation beacon (VHF Omnidirectional Radio Range (VOR), Distance Measuring Equipment (DME));lateral deviation from a selected track;ground speed, distance and time to go;aeronautical map;weather information; plus much more information according to design. Skybrary

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What is a Primary Flight Display (PFD)

The Primary Flight Display (PFD) is an instrument which integrates and depicts, on a single display, all of the information that was historically presented on a number of individual electromechanical instruments. The PFD has evolved from a basic attitude indicator/flight director combination, presented electronically on a CRT, to an Electronic Attitude Direction Indicator (EADI) which, variable by manufacturer, added additional information such as heading, altitude and airspeed. The modern PFD displays virtually all of the information that the pilot requires...

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What is an Electronic Flight Instrument System (EFIS)

An Electronic Flight Instrument System (EFIS) is a flight deck instrument display system in which the display technology used is electronic rather than electromechanical. A typical EFIS system comprises a Primary Flight Display (PFD) (Electronic Attitude Direction Indicator (EADI)) and an Electronic Horizontal Situation Indicator (EHSI) (Navigation Display). In some designs the two displays are integrated into one. Skybrary

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Which headset plugs do you supply?

We stock Binder-7, Fischer, LEMO, Twin GA, US NATO and XLR-5. It is easy to see which headset comes with each plug, just go to our Aviation Headsets section and use the filters on the left to select your required plug. You will then see all the headsets available with that plug.

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What is an aviation headset?

Aviation headsets are worn by pilots and will always have a microphone and be designed for good noise reduction. Lowering the volume of engine, airflow and blade noise is important to protect pilots from loss of hearing. Microphones allow the pilots to communicate with the ground, air traffic control and with others in the aircraft, co-pilot or navigator.

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What is the difference between an ANR and a PNR headset?

ANR stands for Active Noise Reduction, where a microphone picks up the external noise and a mirror of the sound is created electronically and played back out to the ear cups. This effectively cancels out the external noise. It can be extremely effective at removing ambient sounds creating a very clear headset for pilots, protecting your hearing from engine noise. They are design to cancel low frequency sound, so speech, engine noise changes and airflow are easily picked up....

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What are the differences between the Icom A25 models and packages ?

The Icom A25 radio replaced the A6 and A24 models. The CE version is a COM transceiver only and the NE version also has a VOR/LOC receiver and a bluetooth headset interface built-in. Both units have the same radio features and take the same accessories. These units come in two packages - SPORT and PRO. The SPORT package comes with an Alkaline battery case, aircraft power supply, antenna, belt clip and handstrap. The PRO package includes a rechargeable Lithium battery instead of the alkaline...

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What is the difference between low and high impedance microphones ?

Electret microphones which are high impedance and require a drive voltage to operate. Electret microphones are very sensitive and often contain a noise-cancelling circuit to reduce background noise. Standard GA headsets use electret microphones Dynamic microphones are low impedance. They are not sensitive and usually only pick up noise within a few inches of the microphone so they tend not to pick up wind or engine noises and are ideal for noisy or open cockpit aircraft. Military...

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